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Journal of Materials Science

, Volume 29, Issue 12, pp 3167–3171 | Cite as

Growth kinetics of spherulitic apatite in some MgO-CaO-SiO2-P2O5 glasses

  • Jiin Jyh Shyu
  • Jenn Ming Wu
Article

Abstract

Crystallization of glasses with compositions (wt%) of 11.2 MgO, 33.3 SiO2, (55.5−x) CaO, and xP2O5 (x=18.3, 16.65, 15.825 and 15.0) resulted in a spherulitic apatite phase with different crystal morphologies. An ellipsoidal morphology was observed for x=18.3, 16.65 and 15.825, and an anomalous morphology was observed for x=15.0. A metastable phase, which was similar in some characteristics to apatite, was also found for x=15.0. The growth kinetics of the spherulitic apatite crystals were investigated to explain the above observations. Both the dendrite arms along the [0001] and [1 1¯20] directions of the apatite crystals showed constant growth rates in each glass. Growth-rate anisotropy was found between these two directions. The ellipsoidal shape of the apatite crystals is explained by this growth-rate anisotropy. The growth rates, and the growth-rate anisotropy, varied with the P2O5 content in such a manner that the changes in phase formation behaviour can be explained on the basis of the kinetic results.

Keywords

Crystallization SiO2 Apatite P2O5 Growth Kinetic 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    H. Broemer, K. Deutscher, B. Blencke, E. Pfeil, and V. Strunz, Sci. Ceram. 9 (1977) 219.Google Scholar
  2. 2.
    W. Vogel, W. Höland, K. Naumann and J. Gummel, J. Non-Cryst. Solids 80 (1986) 34.CrossRefGoogle Scholar
  3. 3.
    T. Nakamura, T. Yamamuro, S. Higashi, T. Kokubo and S. Ito, J. Biomed. Mater. Res. 19 (1985) 685.CrossRefGoogle Scholar
  4. 4.
    T. Kokubo, S. Ito, M. Shigematsu, S. Sakka and T. Yamamuro, J. Mater. Sci. 20 (1985) 2001.CrossRefGoogle Scholar
  5. 5.
    T. Kokubo, S. Ito, S. Sakka and T. Yamamuro, ibid. 21 (1986) 536.CrossRefGoogle Scholar
  6. 6.
    T. Kasuga, K. Nakajima, T. Uno and M. Yoshida, in “Handbook of bioactive ceramics”, Vol. 1, edited by T. Yamamuro, L. L. Hench and J. Wilson, (CRC press, Boca-Raton, FL, 1990) p. 137.Google Scholar
  7. 7.
    J. J. Shyu and J. M. Wu, J. Amer. Ceram. Soc. 73 (1990) 1062.CrossRefGoogle Scholar
  8. 8.
    Idem., ibid. 74 (1991) 1532.CrossRefGoogle Scholar
  9. 9.
    P. F. Kerr, in “Optical mineralogy” (McGraw-Hill, New York, 1977) p. 264.Google Scholar
  10. 10.
    J. J. Shyu, “Crystallization behavior of glasses in the system MgO-CaO-SiO2-P2O5”, PhD dissertation, National Tsing Hua University, Republic of China (1991).Google Scholar
  11. 11.
    B. D. Cullity, in “Elements of X-ray diffraction”, 2nd Edn (Taiwanese edition, 1981) p. 350.Google Scholar
  12. 12.
    D. R. Uhlmann, in “Advances in nucleation and crystallization in glasses”, edited by L. L. Hench and S. W. Freiman (American Ceramic Society, Columbus, OH, 1972) p. 91.Google Scholar
  13. 13.
    Z. Strnad, in “Glass-ceramic materials”, Glass Science and Technology 8, (Elsevier, Amsterdam, 1986) p. 63.Google Scholar
  14. 14.
    H. E. Buckley, in “Crystal growth” (Wiley, New York, 1951) p. 178.Google Scholar

Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Jiin Jyh Shyu
    • 1
  • Jenn Ming Wu
    • 2
  1. 1.Department of Materials EngineeringTatung Institute of TechnologyTaipeiTaiwan
  2. 2.Department of Materials Science and EngineeringNational Tsing Hua UniversityHsinchuTaiwan

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